[PDF] Linux 101 Hacks - Free eBook 12-Feb-2009 Chapter 4:





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Linux 101 Hacks www.thegeekstuff.com

Table of Contents

Introduction............................................................. 7 Foreword................................................................. 8 Version.................................................................... 8 Chapter 1: Powerful CD Command Hacks......................... 9 Hack 1. Use CDPATH to define the base directory for cd command...9 Hack 2. Use cd alias to navigate up the directory effectively......... 10 Hack 3. Perform mkdir and cd using a single command................ 13 Hack 4. Use "cd -" to toggle between the last two directories....... 14

Hack 5. Use dirs, pushd and popd

to manipulate directory stack..... 14

Hack 6. Use "shopt -s cdspell"

to automatically correct mistyped directory names on cd ......................................................... 17 Chapter 2: Date Manipulation.......................................18 Hack 7. Set System Date and Time.......................................... 18 Hack 8. Set Hardware Date and Time....................................... 19 Hack 9. Display Current Date and Time in a Specific Format.......... 19 Hack 10. Display Past Date and Time....................................... 21 Hack 11. Display Future Date and Time.................................... 22 Chapter 3: SSH Client Commands..................................24 Hack 12. Identify SSH Client Version........................................ 24 Hack 13. Login to Remote Host using SSH................................. 24 Hack 14. Debug SSH Client Session.......................................... 26 Hack 15. Toggle SSH Session using SSH Escape Character.............. 27 Hack 16. SSH Session Statistics using SSH Escape Character........... 29 Chapter 4: Essential Linux Commands............................31 Hack 17. Grep Command...................................................... 31 2 Linux 101 Hacks www.thegeekstuff.com Hack 18. Find Command....................................................... 33

Hack 19. Suppress Standard

Output and Error Message................. 35

Hack 20. Join Command....................................................... 35 Hack 21. Change the Case..................................................... 36 Hack 22. Xargs Command...................................................... 37 Hack 23. Sort Command....................................................... 38 Hack 24. Uniq Command....................................................... 41 Hack 25. Cut Command........................................................ 42 Hack 26. Stat Command....................................................... 43 Hack 27. Diff Command........................................................ 44 Hack 28. Display total connect time of users............................. 45 Chapter 5: PS1, PS2, PS3, PS4 and PROMPT_COMMAND.......47 Hack 29. PS1 - Default Interaction Prompt................................ 47 Hack 30. PS2 - Continuation Interactive Prompt......................... 48 Hack 31. PS3 - Prompt used by "select" inside shell script............ 49 Hack 32. PS4 - Used by "set -x" to prefix tracing output.............. 50 Hack 33. PROMPT_COMMAND................................................. 52 Chapter 6: Colorful and Functional Shell Prompt Using PS1.53 Hack 34. Display username, hostname and basename of directory in the prompt ....................................................................... 53 Hack 35. Display current time in the prompt............................. 53 Hack 36. Display output of any command in the prompt............... 54 Hack 37. Change foreground color of the prompt........................ 55 Hack 38. Change background color of the prompt....................... 56 Hack 39. Display multiple colors in the prompt.......................... 57 Hack 40. Change the prompt color using tput............................ 58 Hack 41. Create your own prompt using the available codes for PS1 .... 59 Hack 42. Use bash shell function inside PS1 variable................... 61 Hack 43. Use shell script inside PS1 variable............................. 61 Chapter 7: Archive and Compression..............................63 3 Linux 101 Hacks www.thegeekstuff.com Hack 44. Zip command basics................................................ 63 Hack 45. Advanced compression using zip command................... 65 Hack 46. Password Protection of Zip files................................. 66 Hack 47. Validate a zip archive.............................................. 66 Hack 48. Tar Command Basics................................................ 67 Hack 49. Combine gzip, bzip2 with tar..................................... 68 Chapter 8: Command Line History.................................70 Hack 50. Display TIMESTAMP in history using HISTTIMEFORMAT...... 70 Hack 51. Search the history using Control+R............................. 70 Hack 52. Repeat previous command quickly using 4 different methods .............. 72 Hack 53. Execute a specific command from history..................... 72 Hack 54. Execute previous command that starts with a specific word .............. 73 Hack 55. Control the total number of lines in the history using

HISTSIZE

... 73 Hack 56. Change the history file name using HISTFILE.................. 73 Hack 57. Eliminate the continuous repeated entry from history using

HISTCONTROL

.................................................................... 74 Hack 58. Erase duplicates across the whole history using HISTCONTROL.................................................................... 75 Hack 59. Force history not to remember a particular command using HISTCONTROL.................................................................... 76 Hack 60. Clear all the previous history using option -c................. 76 Hack 61. Substitute words from history commands..................... 77 Hack 62. Substitute a specific argument for a specific command.... 77 Hack 63. Disable the usage of history using HISTSIZE................... 78 Hack 64. Ignore specific commands from the history using HISTIGNORE .............. 78 Chapter 9: System Administration Tasks.........................80 Hack 65. Partition using fdisk................................................ 80 Hack 66. Format a partition using mke2fsk............................... 82 Hack 67. Mount the partition................................................. 84 4 Linux 101 Hacks www.thegeekstuff.com Hack 68. Fine tune the partition using tune2fs.......................... 84 Hack 69. Create a swap file system......................................... 86 Hack 70. Create a new user................................................... 87 Hack 71. Create a new group and assign to an user..................... 88 Hack 72. Setup SSH passwordless login in OpenSSH..................... 89 Hack 73. Use ssh-copy-id along with ssh-agent........................... 91 Hack 74. Crontab................................................................ 92 Hack 75. Safe Reboot Of Linux Using Magic SysRq Key.................. 94 Chapter 10: Apachectl and Httpd Examples.....................97 Hack 76. Pass different httpd.conf filename to apachectl............. 97 Hack 77. Use a temporary DocumentRoot without modifying 98
Hack 78. Increase the Log Level temporarily............................. 99 Hack 79. Display the modules inside Apache.............................100 Hack 80. Show all accepted directives inside httpd.conf..............101

Hack 81. Validate the httpd.

conf after making changes...............101 Hack 82. Display the httpd build parameters............................102 Hack 83. Load a specific module only on demand......................103 Chapter 11: Bash Scripting........................................ 105 Hack 84. Execution Sequence of .bash_* files...........................105 Hack 85. How to generate random number in bash shell..............106 Hack 86. Debug a shell script................................................107 Hack 87. Quoting...............................................................108 Hack 88. Read data file fields inside a shell script......................110 Chapter 12: System Monitoring and Performance............ 112 Hack 89. Free command......................................................112 Hack 90. Top Command.......................................................113 Hack 91. Ps Command.........................................................116 Hack 92. Df Command.........................................................118 Hack 93. Kill Command.......................................................119 Hack 94. Du Command........................................................121 5 Linux 101 Hacks www.thegeekstuff.com Hack 95. lsof commands......................................................121 Hack 96. Sar Command.......................................................124 Hack 97. vmstat Command...................................................126 Hack 98. Netstat Command..................................................128 Hack 99. Sysctl Command....................................................130 Hack 100. Nice Command....................................................132 Hack 101. Renice Command.................................................134

12 Amazing and Essential Linux Books.......................... 136

Extended Reading................................................... 139 Your Feedback and Support....................................... 140 Subscribe to TGS...............................................................140 Contact TGS.....................................................................140 6 Linux 101 Hacks www.thegeekstuff.com

Introduction

"There are only 10 types of people in the world - those who understand binary, those who don't, and those who understand gray code" - Geek There are total of 101 hacks in this book that will help you build a strong foundation in Linux. All the hacks in this book are explained with appropriate

Linux command examples that are easy to follow.

This book contains 12 chapters. Hacks mentioned in 6 chapters are based on the articles that I've already posted on my blog. Hacks mentioned in rest of the 6 chapters are brand new. I'm Ramesh Natarajan, author of The Geek Stuff blog and this eBook.

I have done intensive programming on several

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